If the greenhouse effect on Earth were absent, Earth's average temperature would be about
A) -18°C.
B) appreciably warmer.
C) as it is now.
Answer: A
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When a tube of diameter d is placed in water, the water rises to a height h. If the diameter were half as great, how high would the water rise?
A) 4h B) h/2 C) 2h D) h/4 E) h
A rectangular coil lies flat on a horizontal surface. A bar magnet is held above the center of the coil with its north pole pointing down. If the magnet is dropped from this position what is the direction of the induced current in the coil?
A) There is no current in the coil. B) counterclockwise C) clockwise D) Not enough information is provided.
The figure below shows a planet traveling in a counterclockwise direction on an elliptical path around a star located at one focus of the ellipse. When the planet is at point A,
a.
its speed is constant.
b.
its speed is increasing.
c.
its speed is decreasing.
d.
its speed is a maximum.
e.
its speed is a minimum.
Which of the following are SI units of Young's modulus? (There could be more than one correct choice.)
A) N/m ? s2 B) kg/m2 C) kg ? m/s2 D) kg/m ? s2 E) kg ? m2/s2